Sill



FIG. 1 is a rear isometric view of a sill.

FIG. 2 is a front isometric view thereof.

FIG. 3 is a rear elevation view thereof.

FIG. 4 is a front elevation view thereof.

FIG. 5 is a right side elevation view thereof.

FIG. 6 is a left side elevation view thereof.

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

In FIGS. 1-4 and 7-8, the sill is shown with a symbolic break in its length. The appearance of any portion of the sill between the break lines forms no part of the claimed design. 

CLAIM The ornamental design for a sill, as shown and described. 